I found the following item in the June 25-July 1, 2005, issue of New Scientist. I've highlighted what I feel is the important part.
Brain scans find the penis at last
At last we know where the penis is represented in the male brain.
The genitalia's location on the 'homunculus', the brain's map of body parts, has been in dispute since the 1920s. Now Christian Kell at the University of Frankfurt in Germany has put eight men into an MRI scanner to help settle the question. Using a soft brush, Kell stroked parts of each volunteer's body while recording brain activity.
Each man's penis was represented in the same place - flanked by the areas for the toes and abdomen - Kell told the Organisation of Human Brain Mapping annual meeting in Toronto. "The only depressing thing," he says, "is that the representation is very small."
Well, no shit it's a small area. But perhaps Mr. Kell should have investigated whether it was capable of blocking off functions of other areas. And is that the best gay pickup method you've ever heard of? I'm a scientist. I'd like to put you in an MRI scanner and stroke your body with a soft brush.